How to call a Javascript function in rails helper

Question

I am new to rails. I have created a helper method with a loop. Inside the loop, I want to call a javascript function. Following is the code I have written. Any help would be appreciated. Helper method

def test_helper param1
   param1.each do |x|
     "js_function(x.col1, x.col2)"
   end
end

in javascript file test.js

function js_function(x1, x2){

}

Jay-Ar Polidario · Accepted Answer · 2017-07-31 13:42:33Z

1

Helper File:

def test_helper param1
  javascript_tag(
    param1.map do |x|
      "js_function(\"#{j raw(x.col1)}\", \"#{j raw(x.col2)})\";"
    end.join("\n")
  )
end

View File:

<%= test_helper SOMEPARAM %>

Will Render HTML (Something Like):

<script>
  js_function(SOMEVALUEA1, SOMEVALUEA2);
  js_function(SOMEVALUEB1, SOMEVALUEB2);
</script>

edited Jul 31, 2017 at 13:42

answered Jul 31, 2017 at 11:57

Jay-Ar Polidario

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22 Comments

user2083041 Over a year ago

Thanks, Jay. I am getting an error in browser console when I used your suggestion. <script type="text/javascript"> //<![CDATA[ //

user2083041 Over a year ago

Uncaught SyntaxError: Unexpected identifier <script type="text/javascript"> //<![CDATA[ //

Jay-Ar Polidario Over a year ago

Perhaps you might not need the outer <script>..</script> anymore. I'm updating my answer

user2083041 Over a year ago

If I don't specify javascript_tag the function is displaying as a string in browser console with '' for empty params. e.g., js_function(('', 'abc');

Jay-Ar Polidario Over a year ago

What was the full error message? I just tried this on my sample rails project, and I did not get any error message on the browser.

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